JPH08256206A - Satellite line detour connection method - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a satellite circuit detour connection method that can secure calls to remote islands using a satellite network even in the event of a disaster. [Structure] Communication lines 205, 208 to remote island subscriber exchange 105
In the bypass connection method of the satellite line including, the relay exchange 101 performing the bypass connection, when the received communication call is determined to be a communication call to a specific destination 103c specified in advance, in the communication call concerned Only the priority communication call specified when the call was made
It is characterized in that it is connected to a detour to 5,208. [Effect] Telephone calls to remote islands that do not have a bypass line other than satellite lines can be secured more stably than in the conventional method even in the event of a disaster.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite circuit bypass connection method for communication calls in a communication network.

[0002]

2. Description of the Related Art In the conventional line connection method for communication calls in a communication network, a satellite network is automatically selected as a final detour destination due to communication to remote islands and congestion on the ground network.

[0003]

Since the conventional traffic control by TCS (traffic control system) is intended to avoid congestion of the terrestrial exchange, in the case of a large-scale disaster, general telephone calls and priority telephone calls at the time of disaster are concentrated. There is a possibility that the satellite network may be congested by the satellite, and in that case, there arises a problem that the communication to the remote islands which must use the satellite network cannot be stably supplied. Further, conventionally, in the satellite detour prohibition of ordinary telephone calls, the maintenance is prohibited by designating "all restrictions on ordinary telephone calls to the satellite route" by a command. However, in this method, communication calls to all satellite networks are prohibited, so in addition to telephone calls for congestion destinations, which are originally subject to regulation, general telephone calls to remote islands and other than congestion destinations There was a problem that ordinary telephone calls to the ground were also restricted (see Fig. 3).
On the other hand, when the command is not input, there is a problem that the congestion of the satellite network cannot be avoided and the communication to the remote island cannot be stably supplied (see FIG. 4).

The present invention has been made under such a background, and provides a satellite circuit bypass connection method capable of stably securing a communication call to a remote island using a satellite network even in the event of a disaster or the like. The purpose is to do.

[0005]

According to the first aspect of the present invention,
A bypass connection method for a satellite line including a communication line to a remote island subscriber exchange, wherein the relay exchange station performing the bypass connection comprises:
When it is determined that the received communication call is a communication call to a specific destination specified in advance, only the priority communication call specified at the time of origination among the communication calls is detour-connected to the satellite line.

The invention according to claim 2 is characterized in that the specific destination is a congestion destination on which incoming connection calls are concentrated, and the detour connection is performed only in a congestion time zone.

Further, the invention according to claim 3 is characterized in that the detour connection to the satellite line is limited to a communication call that cannot make a detour connection to the terrestrial line network among the priority communication calls. To do.

Further, in the invention according to claim 4, the determination of the specific ground is performed based on the called station code information of the address signal of the common line signal at the time of connecting the communication call, and the priority call is designated. It is characterized in that it is performed based on the priority class determination information of the common line signal when the communication call is connected.

[0009]

According to the above construction, when the relay exchange that makes the bypass connection of the satellite circuit determines that the received communication call is a communication call to a specific destination specified in advance, the relay switching center can make a call during the communication call. Only the designated priority communication call is bypass-connected to the satellite line.

According to another configuration, the specific destination is a congestion destination where incoming connection calls are concentrated and the detour connection is performed only in the congestion time zone.

Further, according to another configuration, the detour connection to the satellite line is limited to the communication call that cannot make the detour connection to the ground line network among the priority communication calls.

According to another configuration, the determination of the specific ground is performed based on the called station code information of the address signal of the common line signal at the time of connecting the communication call, and the priority call is specified by the communication call. This is performed based on the priority class determination information of the common line signal at the time of connection.

Therefore, according to each of the above-mentioned constitutions, in the relay exchange which performs the bypass connection of the satellite line, by restricting the outgoing connection to prohibit the bypass of the general telephone call of the specific time or the specific destination to the satellite line. It is possible to avoid congestion of the satellite network. As a result, telephone calls to remote islands that do not have communication lines other than satellite lines can be more stably secured even in times of disaster.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the configuration of a communication network according to the satellite circuit bypass connection method of the present invention. In this figure, the communication network 100 includes a satellite 104,
Group center 105 located in a remote island, zone centers 101 installed in the terrestrial network and functioning as a repeater exchange
103, terminal stations 101a, 102a and 103a housed in the zone centers 101 to 103, group centers 101b, 102b and 103b, and relay lines 201 to 212 connecting them.

In this figure, the zone center 10
Reference numeral 1 is an exchange that carries out outgoing connection control, which is a feature of the present invention. Further, the terminal stations 101a, 102a and 103a and the group centers 101b, 102b, 103b and 1
Reference numeral 05 is a subscriber line exchange, and each accommodates a plurality of subscriber terminals (not shown). Further, 105c represents a joining area on a remote island, 102c represents a joining area in a terrestrial network in which no congestion has occurred, and 103c represents a joining area in a terrestrial network in which congestion has occurred. In addition,
In this case, the signal system for connecting the stations in the communication network 100 is the common line signal system (not compatible with the line). However, the lines 201, 210 and 212 between the terminal stations 101a, 102a and 103a and the zone centers 101, 102 and 103 respectively are line-corresponding individual line signaling systems. In addition, this terminal station 101a, 102a, 103a
Can be replaced by a group center, and all can be performed by the common line signaling method.

Next, the operation of the satellite circuit bypass connection method in the communication network 100 will be described with reference to FIG. FIG. 2 shows a zone center 101 which is an exchange control enforcement exchange.
5 is a flowchart showing a flow of processing for call connection in FIG. The flow of processing for call connection in the zone center 101 will be described below for different outgoing call conditions.

Conditions: For example, the group center 101b
If a call is made from the ordinary telephone subscriber accommodated in the subscriber to the subscriber in the subscriber area 103c, which is the congestion ground (regulated ground), the call of the subscriber is transmitted to the zone center 101 and the outgoing connection is made. The process starts (step 30)
0). First, in step 301, it is determined whether the call that has occurred is a restricted call to the ground. Step 301
If it is determined that the product is destined for regulation, then step 3
If it is determined that it is not directed to the restricted ground (a call to a remote island and a call outside the restricted ground), the procedure proceeds to step 312. In this case, since the call is directed to the restricted ground, the process proceeds to step 302. The determination in step 301 is
This is performed based on the destination ID information (terminating station code information) of the address signal (IAM signal) of the generated call.

At step 302, it is determined if the call in question is a restricted encounter call. In other words, if the target call does not correspond to a call (regulated passing call) whose passage is permitted at a fixed rate (a percentage of the call), it is determined that the call is a regulated encounter call, and the Proceed to 303 and the call is talk talk connected. On the other hand, if it is determined in step 302 that the call is a restricted passing call, the process proceeds to step 304, and the restricted passing call display of the call is set to “ON”. Here, it is assumed that it is determined in step 302 that the call is a restricted passing call, the process proceeds to step 304, the restricted passing call display is set to “ON” in step 304, and then the process proceeds to step 305.

At step 305, line acquisition on the terrestrial network is tried for the call, and at step 306, it is determined whether the line acquisition on the terrestrial network is possible. Step 30
If it is determined in 6 that the terrestrial network can be captured, the process proceeds to step 307. When the process proceeds to step 307, here, for example, the trunk line 204 is used to establish a line connection by the terrestrial network. On the other hand, if it is determined in step 306 that the line cannot be captured on the terrestrial network, the process proceeds to step 308. In this case, it is assumed that the line cannot be captured by the trunk line 204 and the process proceeds to step 308.

At step 308, the content of the restricted passing call display is judged. If the restricted passing call display is “ON” in step 308, the process proceeds to step 309 and “OF” is displayed.
If “F”, the process proceeds to step 310. In this case, since the restricted passing call display is set to "ON" in step 304, the process proceeds to step 309, and it is determined whether the call is in the disaster priority telephone class. Step 3
In 09, if it is determined that the target call is in the disaster priority telephone class, the process proceeds to step 310, while
If it is determined that the call is an ordinary phone, step 311
Go to. In this case, since this call is a general telephone call, the process proceeds to step 311. Then, in step 311, this call is connected to BT (between-call tone), and the process ends.

The class determination in step 309 is made by the "priority class determination information (data)" in the address signal given by the originating exchange (in this case, the group center 101b).

Condition: Next, a case will be described in which, under the same conditions as those described above, only the priority telephone class is different from the conditions and the telephone call is set at the time of disaster. A call is now generated, and the zone center 101
Then, when the outgoing connection process is started, it is assumed that the process proceeds from step 300 to step 302, further proceeds from step 304 to step 305, step 306, and then proceeds to step 308. In this case, further step 3
From 08 to step 309, step 309 determines if the call is in a disaster priority telephone class. In this case, in step 309, it is determined that the telephone class is the priority telephone class at the time of disaster, so the process proceeds to step 310
In step 310, satellite route (relay line 205, satellite 10
4 and the relay line 207 to the zone center 103). And zone center 1
03 and the group center 103b or the terminal station 103a to call the subscriber of the other party.

Condition: Next, for example, if a general telephone subscriber accommodated in the group center 101b makes a call to a subscriber in the subscriber area 102c which is not the congestion destination, this call is sent to the group center. It is transmitted to the zone center 101 via 101b, and the outgoing connection processing is started there (step 300). In this case, step 30
The procedure proceeds from 0 to step 301, and since it is determined in step 301 that the call is not to the restricted ground, step 31
Proceed to 2. In step 312, the regulation passing call display is initialized (set to “OFF”), and the process proceeds to step 305. In step 305, line acquisition by the terrestrial network is tried. Then, the process proceeds to step 306 and step 30
At 5, it is determined whether or not the ground network acquisition is possible. In this case, for example, if it is possible to capture the line by the terrestrial network relay line 203 in step 305,
From step 306 to step 307, step 3
At 07, the target call is received by the destination subscriber terminal via the trunk line 203, the zone center 102 and the group center 102b or the terminal station 102a.

On the other hand, if it is impossible to capture the line by the terrestrial network in step 305, and if the result of the determination in step 306 is to proceed to step 308, in this case, the restricted passing call display is "OFF", so step 310. Go to. Then, in step 310, for example, the trunk line 20
5, satellite 104, relay line 206 and zone center 102
The line is connected to and the call is made to the subscriber terminal of the other party in the same manner as in the above case.

Condition: Here, for example, it is assumed that a call is made from a general telephone subscriber accommodated in the group center 101b to a subscriber in the subscription area 105c on the remote island.
In this case, the process proceeds from step 300 to step 301 and step 312, and then to step 305. In step 305, since it cannot be captured by the ground network, the process proceeds to step 306. Then, as a result of the determination in step 306, the process proceeds to step 308, and as a result of the determination there,
The process proceeds from step 308 to step 310. At step 310, the trunk line 205, the satellite 104, and the trunk line 208.
A line is connected to the group center 105 via the call center to call the destination subscriber accommodated in the group center 105.

As described above, according to the processing shown in FIG. 2, the satellite detour is prohibited for the general telephone call to the restricted ground. Also, for disaster-preferred telephone calls and ordinary telephone calls other than those destined for regulated land, the line is preferentially captured by the terrestrial network, and the line that uses the satellite circuit if the line is not captured by the terrestrial network. The connection is made. Therefore, it becomes possible to perform stable communication to remote islands using satellite links.

In the flowchart shown in FIG. 2, in step 302, regardless of the priority telephone class,
Although the judgment is made on the restricted encounter call, it is also possible to judge the restricted passing call by, for example, preferentially passing the disaster priority telephone call in the judgment in step 302. . As described above, in the above embodiment of the present invention, a call to the congestion ground, the disaster priority telephone class of the call that did not encounter the regulation is identified, and the detour to the satellite network is performed by the communication network. The system controls automatically. That is, the emergency priority telephone is controlled so as to be allowed to bypass the satellite line and the ordinary telephone is prohibited to be bypassed. Further, a general telephone call for which satellite detour is prohibited is BT-connected as when all outgoing lines are busy.
Therefore, the prohibition of satellite detour can be automatically performed according to the disaster priority telephone class, whereby the congestion of the satellite network can be avoided.

In the description of the above embodiment, the common line signal system is used as the communication system between the stations, and the information in the address signal transmitted on the common line signal line is used in each judgment in the connection processing. However, since the information used for determining the connection processing may be the information about the destination number and the priority class, the communication system is not limited to the common line signaling system, and the individual line corresponding to the conventional line is used. The present invention can be applied to an analog system such as a signal system. In the case of the individual line signaling method (including the case of calling from EO such as 201 in FIG. 1), the class determination in step 309 in FIG.
This is performed by the priority class judgment information given to the incoming line of the zone center 101) in FIG.

[0029]

As described above, according to the present invention, a telephone call to a remote island that does not have a bypass line other than a satellite line is more stable than a conventional method even in the event of a disaster. The effect is that it can be secured.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a communication network by a satellite circuit bypass connection method according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of line connection processing in an exchange / connection regulation enforcement switching center (zone center 101) shown in FIG.

FIG. 3 is a block diagram showing a state of the communication network when a general telephone call total restriction command is input to a satellite route in a conventional communication network.

FIG. 4 is a block diagram showing a state of a communication network when a general telephone call total restriction command is not input to a satellite route in a conventional communication network.

[Explanation of symbols]

 101 Zone Center (Relay Exchange) 103c Congestion Ground Joining Area 104 Satellite 105 Group Center (Subscriber Exchange) 105c Joining Area on Remote Island 205, 208 Relay Line

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Keiichi Yanagihara 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Takeshi Yanagisawa 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (4)

[Claims] 1. A bypass connection method for a satellite line including a communication line to a remote island subscriber exchange, wherein a relay exchange that performs the bypass connection communicates a received communication call to a specific destination designated in advance. A satellite circuit bypass connection method characterized in that, when it is determined that the call is a call, only the priority communication call specified at the time of the call among the communication calls is bypass-connected to the satellite circuit. 2. The satellite circuit detour connection method according to claim 1, wherein the specific destination is a congestion destination where incoming connection calls are concentrated, and the detour connection is performed only in a congestion time zone. 3. The bypass connection to the satellite line is limited to a communication call that was not able to make a bypass connection to the terrestrial line network in the priority communication call.
The satellite circuit bypass connection method described in. 4. The determination of the specific destination is performed based on the called station code information of the address signal of the common line signal at the time of connecting the communication call, and the priority call is designated by the common line at the time of connecting the communication call. The satellite circuit bypass connection method according to claim 1, wherein the method is performed based on signal priority class determination information.